Denotes a mingling or intermixing with distinct or separable objects. (See Usage Note at amidst.)
How can you speak with authority about their customs when you have never lived among them?
Denotes a belonging of a person or a thing to a group.
He is among the few who completely understand the subject.
Denotes a sharing of a common feature in a group.
Lactose intolerance is common among people of Asian heritage.